单词	strontium 90
释义	strontium 90 noun : a heavy radioactive isotope of strontium of mass number 90 that has a half-life of 29 years, that is present in nuclear waste and fallout, and that is hazardous because like calcium it can be assimilated in biological processes and deposited in the bones of human beings and animals Example Sentences Recent Examples on the Web The cows in pastures were eating grass that was [contaminated] by strontium 90. Michael Schulman, The New Yorker, 17 June 2021 Word History First Known Use 1952, in the meaning defined above Medical Definition strontium 90 noun : a heavy radioactive isotope of strontium having the mass number 90 that is present in the fallout from nuclear explosions and is hazardous because like calcium it can be assimilated in biological processes and deposited in the bones of human beings and animals called also radiostrontium
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